Holden's encounter with the girls in the Lavender Room occurs in Chapter Ten. He says that the girl he dances with is named "Bernice something." He cannot remember if her last name is "Crabs" or "Krebs" (though the latter seems more likely.) The other two girls, who he identifies as "the two ugly ones" were named Marty and Laverne.
The important thing is that all three of the girls are examples of the type of person Holden despises. They seem superficial and shallow, and are obsessed with seeing movie stars and celebrities in New York City. Holden professes to have nothing but contempt for them, yet he seems very concerned with impressing them. Indeed, it may strike the reader that part of Holden's professed disdain for them is a result of the fact that they don't seem all that interested in spending time with him.
Source: J.D. Salinger, The Catcher in the Rye (New York: Bantam Books, 1965) 72-75.